Amazing! Beautiful popcorn-like crystals actually growing out of a rock. How is this possible? In this demonstration, the teacher performs tests on a limestone rock to determine some of its chemical and physical properties. The rock is then placed in a dish of acetic acid solution and left undisturbed for several days. Watch as puffy crystals slowly appear to sprout from inside the rock! When enough crystals have grown, they are removed and tests are performed. Students record their observations and determine from the data whether the new crystals are the result of a chemical reaction. This demonstration is an effective and fun way to introduce the topics of crystals, chemical reactions and the effect of acids on carbonates. Teacher demonstration notes, along with reproducible student worksheets, are included. Enough materials are included to perform the demonstration seven times.
Concepts: Crystal formation, chemical reactions, properties of acids.
Time Required: 2 class periods, l0 minutes each. Rock crystals grow in about five days.
Materials Provided: Acetic acid solution, chalk, limestone rock, lithium chloride, weighing dishes.
Note: Some common household items and laboratory equipment are required but not provided.
Additional ResourcesNo Additional Resources at the time.
Flinn Catalog/Reference Manual Page 399
Flinn Middle School Catalog/Reference Manual Page 349
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